Molding machine



Jan. 16, 1940. e. WALTHER MOLDING MACHINE Filed May 1, 1937 INVENTOR, Y 9 )4 44 ATTORNEY 9 UNITED STATES PA patternafter themold is made makes thecore unnecessary, since itTenables thepattern to be 1 loweredwithout breaking the fin-forming cavities.

Other important and incidentalobjects will be brought outin the following specification and Patented Jan. 16, 1940 1 Moonrise MACHINE George Walther, near ,l l'ayton; Ohio, assignor i t l to The Dayton Steel Foundry Company, Dayton ohio a corporation ofo hio l Application May 1,; 1937," Serial No. 140,212

cla s. (01. 2 5163} Y f Thisinvention relates to new and usefulimprovements in molding machines.

"It is one of the principal objects of'my invention to providev a molding machine in which a sandjmold produced by a sandrslinger operation for making castings such as brake drums having cooling finaniay be produced without a drysand core. Conventionally, when such moldsare made, a dry sand core having thesefins is set in the mold. However, my means for contractingthat particularlyset forth inthe subjoined claims.

Inthe accompanying drawing illustrating one form of embodiment of my invention, Figure l 'is a side vie-W. of a molding machine containing my contractible cope pattern. Figure 2 is atop plan view of the contractible pattern and the removable operating unit therefor. And Figure 3 is a perspective view of the holder for the pattern and its operating mechanism.

Reierringto the accompanying drawing for a detailed description of the form of embodiment of my-invention, disclosed therein, the numeral I designates the frame of a molding machine have ing bottom side members 2 upon which bearing brackets 53 are mounted. These brackets are mounted intwo pairs, one at. each end of the machine to support two transverse shafts 4, 4.

Secured to each shaft 4 are two end links 5 that are pivotally connected by pins 5 to links I. The upper ends of the links 1 are pivotally secured to brackets 8 attached to the under side of a pattern plate 9. 1 l Mounted, upon the central portion of the pat to the under side of the. middle portion of the mental sections, a greater or a less number may;

pattern top plate It, within a space defined by an annular rip it on the latter.

Slidable betwecn the pattern top plate l3 and l wardly projecting fife-forming ribs l1. These segmentalsections form together an annular wall around which sand packed within an enclosing it. While I have shown four of these segbe employed. n

For the purpose of lowering the pattern without breaking thefin-forming cavities of the mold,

tachedto the lower end of the shaft 25 is a fhandle Ztbymeans of which the shaft may be s11 to-clear the cavities which theyform in the sandmold. i n l ifi hilel have shown" a wristplate' and link "mechanismfor operating the segmental pattern I provide the following means for pulling theseg lnentalsections inwardly beforethe pattern .is drawn by the handle l9 secured to one of the shafts 4. Formed on the inner peripheral portion of eachsegmental section is a lug M to which 5 o end of a link 2| is pivotally attached. The

other end of each link M is pivotallysecured to one arm 21% of a wrist plate 23 having a hub 24 secured to a vertioalshaft 25. The latter is removab'ly journaled in the lower and upper pat- *ternplates 9 and i5.

This shaft 25 and its operating connections such as the wrist plate and link maybe removed as unit and inserted in another machine of the same construction. At-

rotated to draw the segmental sections inwardly a su'fiicientdistance to permit the annularmibs sections it and i6, cam fluid or other suitable means may be employed for this purpose without departing from the spirit of the invention.

The inward movement of the segmental sections is made possible by forming elongated slots 2'! in the links Zl which actuate the segmental latter to draw segmental sections it It inwardly only after their ends are cleared by the inwardly moving segmental sections [6, l6.

. In order. to spread the segmental sections I6,

Hi a sufficientdistance to permit the other secqtions l6, iii to move outwardly between them tern plate 9 is a spacer such as the disc casting i when it is desired to forma new mold, compression springs 29 may be. interposed between lugs "the shaft 25 is turned by the handle 26 to draw the segmental sections inwardly, first the sections l6, Hi and then the sections lfi I5 untilthe ribs il -on all of the sections clear the cavities which they have formed in the sand mold. The

handle i9 is then actuated to draw the pattern downwardly out of the mold without breaking those cavities. i Havingdescribed my invention, I claim: 1. A machine for simultaneously forming a mold and grooves therein comprising a frame, a pattern plate, means within said frame for 1 raising and lowering said plate, a pattern comprising peripherally-ribbed segmental sections inwardly and outwardly movable. on said plate,

a flask on said frame over said sections against which green sand is adapted to be rammed after they are moved outwardly, a vertical operating shaft carried by said plate, a wrist plate fixed to said shaft, links connected between said wrist plate and the segmental sections, and means for turning said, shaft to draw the segmental sections inwardly before they are lowered, 'to prevent the breaking of the cavities which their peripheral ribs form in the sand mold in the flask. v 3 p 2. A' machine for simultaneously forming a mold and grooves therein comprising a frame,

raising and lowering said, plate, a plurality of segmental sections inwardly and outwardly slidable on said plate, circumferential fin-forming projections on the peripheries of said sections, said sections when in their outward positions forming an annular peripherally ribbed pattern, a flask on said frame over said sections against which green sand is adapted tobe rammed after they are moved outwardly, a, vertical operating shaft carried by said plate, a handle on said shaft forturning the same, a wrist plate secured to said shaft, a lug on the interior surface of each section,- a link connected between each arm on said wrist plate and each lug, every other link being formed with an elongated slot in its outer end, and a pin on the lug of the segmental section belonging to a slotted link, fitted in its slot, whereby, when the shaft is turned, the first links will draw their segmental sections inwardly before the slotted links engage the pins to draw,

in their respective sections.

3. A machine .for simultaneously forming a mold and grooves therein comprising a frame, a pattern bottom plate, means in said frame for raising and lowering said plate, a pattern to!) plate, ribs projecting upwardly from the pattern bottom plate to support the pattern top plate, segmental sections inwardly and outwardly movable over the bottom plate to form in their outer portions an annular pattern against which green sand is adapted to be rammed before it is contracted, a vertical shaft journaled in the middle portions of said plates, a wrist plate on said shaft, and links secured to said wrist plate for radial projection between said ribs for pivotal connection to the segmental sections to draw the latter inwardly before they are lowered, thereby preventing the breaking of the mold in the flask.

4. A machine for simultaneously forming a mold and grooves therein, comprising in combination, a frame, a pattern associated with said frame and comprising peripherally ribbed segmental sections, a flask on said frame, means associated with said pattern for moving the same axially'respecting said flask, and means for moving said sections inwardly while said pattern is maintained in a pre-determined position axially respecting. said flask, said last-mentioned means comprising an operating member and linkage connecting" said member and said sections.

5. A machine for simultaneously forming a mold and grooves therein, comprising in combination, a frame, a pattern associated with said frame and comprising peripherally ribbedsegmental sections, a flask on said frame, means associated with said pattern for moving the same axially respecting said flask, and means for moving said sections inwardly comprising an operating member, links pivotally connecting said members and said sections, alternate links being provided. with elongated slots, a pin on the segmental section belonging to a slotted link, fitted in its slot, whereby when said member is actuated, certain of said sections will be drawn inwardly before the slotted links engage the pins to draw in their respective sections.

' GEORGE WALTHER. 

